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This article in AJ

  1. Vol. 76 No. 5, p. 791-794
    Received: Dec 19, 1983

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Crop Water Stress Index, Soil Water, and Rubber Yield Relations for the Guayule Plant1

  1. F. S. Nakayama and
  2. D. A. Bucks2



Canopy temperature measurements based on remote infrared thermometric techniques and atmospheric vapor pressure deficits from meteorological parameters were used for developing crop water stress indices (CWSI) for three varieties of the drought-tolerant guayule plant (Purthenium argentatum A. Gray). Measurements were conducted on a coarse-loamy, mixed, hyperthermic Typic Calciorthids soil. Six irrigation levels were used to obtain relations between plant stress and soil water content, and also rubber yield. The results of the initial phase of a long-term experiment showed that the CWSI values were related negatively to the fraction of available soil water in the 0 to 1.8 m of soil depth. The CWSI of the 510-day-old perennial plant taken during the actively growing period could also be inversely related to the rubber yield.

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